1、弹出屏蔽罩一般用在提示用户一些重要信息，和系统自带的UIAlertController起到一样的效果，只不过自定义屏蔽罩弹窗可以使内容更加多元化

2、代码如下

#import <UIKit/UIKit.h>
@class LZExchangeCouponView, BeanCoupon;

@protocol LZExchangeCouponViewDelegate <NSObject>

@optional

/**
 * 确定按钮代理方法
 */
- (void)exchangeCouponViewDelegate:(LZExchangeCouponView *) exchangeCouponView addDefineButton:(UIButton *)defineButton;

/**
 * 关闭按钮代理方法
 */
- (void)exchangeCouponViewDelegate:(LZExchangeCouponView *)exchangeCouponView addColseButton:(UIButton *)colseButton;

@end

@interface LZExchangeCouponView : UIView

/**
 *  兑换券对象
 */
@property (nonatomic, strong) BeanCoupon *coupon;

/**
 *  兑换券代理
 */
@property (nonatomic, weak) id<LZExchangeCouponViewDelegate> delegate;

@end

#import "LZExchangeCouponView.h"
#import "bean/Coupon.h"


@interface LZExchangeCouponView ()

/**
 *  透明背景View
 */
@property (nonatomic, strong) UIView *bgView;

/**
 *  contentView
 */
@property (nonatomic, strong) UIView *couponBgView;

/**
 *  背景图片
 */
@property (nonatomic, strong) UIImageView *bgImageView;

/**
 *  兑换券图片
 */
@property (nonatomic, strong) UIImageView *exchangeImageView;

/**
 *  兑换券提示
 */
@property (nonatomic, strong) UILabel *tsLabel;

/**
 *  兑换天数
 */
@property (nonatomic, strong) UILabel *exchangeLabel;

/**
 *  确定按钮
 */
@property (nonatomic, strong) UIButton *defineButton;

/**
 *  关闭按钮
 */
@property (nonatomic, strong) UIButton *closeButton;

@end

@implementation LZExchangeCouponView

#pragma mark - 初始化
- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        
        //0、透明View
        self.bgView = [[UIView alloc] init];
        self.bgView.backgroundColor = [UIColor blackColor];
        self.bgView.alpha = 0.5;
        [self addSubview:self.bgView];
        
        //1、contentView
        self.couponBgView = [[UIView alloc] init];
//        self.couponBgView.backgroundColor = [UIColor whiteColor];
        [self addSubview:self.couponBgView];
        
        //2、背景图片
        self.bgImageView = [[UIImageView alloc] init];
        self.bgImageView.image = [UIImage imageNamed:@"coupon_bg"];
        [self.couponBgView addSubview:self.bgImageView];
        
        //3、兑换券图片
        self.exchangeImageView = [[UIImageView alloc] init];
        [self.couponBgView addSubview:self.exchangeImageView];
        
        //4、兑换券提示
        self.tsLabel = [[UILabel alloc] init];
        self.tsLabel.text = @"是否现在使用该券";
        self.tsLabel.textAlignment = NSTextAlignmentCenter;
        self.tsLabel.font = [UIFont systemFontOfSize:13.0];
        self.tsLabel.textColor = RWTitleColor(0, 0, 0);
        [self.couponBgView addSubview:self.tsLabel];
        
        //5、兑换天数
        self.exchangeLabel = [[UILabel alloc] init];
//        self.exchangeLabel.text = @"为您开通 7 天的VIP会员";
        self.exchangeLabel.textAlignment = NSTextAlignmentCenter;
        self.exchangeLabel.font = [UIFont systemFontOfSize:15.0];
        self.exchangeLabel.textColor = RWTitleColor(107, 113, 113);
        [self.couponBgView addSubview:self.exchangeLabel];
        
        //6、确定按钮
        self.defineButton = [[UIButton alloc] init];
        [self.defineButton setTitle:@"确定使用" forState:UIControlStateNormal];
        [self.defineButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        self.defineButton.titleLabel.font = [UIFont systemFontOfSize:18.0];
        self.defineButton.titleLabel.textAlignment = NSTextAlignmentCenter;
        [self.defineButton setBackgroundImage:[UIImage imageNamed:@"coupon_queding"] forState:UIControlStateNormal];
        //确定按钮事件
        [self.defineButton addTarget:self action:@selector(defineButtonClick:) forControlEvents:UIControlEventTouchUpInside];
        [self.couponBgView addSubview:self.defineButton];
        
        //7、关闭按钮
        self.closeButton = [[UIButton alloc] init];
        [self.closeButton setImage:[UIImage imageNamed:@"coupon_close"] forState:UIControlStateNormal];
        //关闭按钮事件
        [self.closeButton addTarget:self action:@selector(closeButtonClick:) forControlEvents:UIControlEventTouchUpInside];
        [self.couponBgView addSubview:self.closeButton];
        
    }
    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];
    //防止在block中循环引用
    __unsafe_unretained __typeof(self) weakSelf = self;
    
    //0、透明背景View
    [self.bgView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.mas_equalTo(0);
        make.left.mas_equalTo(0);
        make.right.mas_equalTo(0);
        make.bottom.mas_equalTo(0);
    }];
    
    //1、背景View
    [self.couponBgView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.mas_equalTo(weakSelf.mas_centerX);
        make.centerY.mas_equalTo(weakSelf.mas_centerY);
        make.width.mas_equalTo(302);
        make.height.mas_equalTo(247);
    }];
    
    //2、背景图片
    [self.bgImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.mas_equalTo(0);
        make.left.mas_equalTo(0);
        make.bottom.mas_equalTo(0);
        make.right.mas_equalTo(0);
    }];
    
    //3、兑换券图片
    [self.exchangeImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.mas_equalTo(0);
        make.left.mas_equalTo(0);
        make.right.mas_equalTo(0);
        make.height.mas_equalTo(100);
    }];
    
    //4、兑换券提示
    [self.tsLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.mas_equalTo(weakSelf.exchangeImageView.mas_bottom).offset(20);
        make.left.mas_equalTo(0);
        make.right.mas_equalTo(0);
        make.height.mas_equalTo(20);
    }];
    
    //5、兑换天数
    [self.exchangeLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.mas_equalTo(weakSelf.tsLabel.mas_bottom).offset(10);
        make.left.mas_equalTo(0);
        make.right.mas_equalTo(0);
        make.height.mas_equalTo(30);
    }];
    
    //6、确定按钮
    [self.defineButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.bottom.mas_equalTo(-8);
        make.left.mas_equalTo(30);
        make.height.mas_equalTo(40);
        make.right.mas_equalTo(-30);
    }];
    
    //7、关闭按钮
    [self.closeButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.mas_equalTo(270);
        make.top.mas_equalTo(-25);
        make.height.mas_equalTo(50);
        make.width.mas_equalTo(50);
    }];
}

#pragma mark - 关闭按钮事件
/**
 * 关闭按钮事件
 */
- (void)closeButtonClick:(UIButton *) closeButton {
    NSLog(@"点击了关闭按钮");
    if ([self.delegate respondsToSelector:@selector(exchangeCouponViewDelegate:addColseButton:)]) {
        [self.delegate exchangeCouponViewDelegate:self addColseButton:closeButton];
    }
}

#pragma mark - 确定按钮事件
/**
 * 确定按钮事件
 */
- (void)defineButtonClick:(UIButton *) defineButton {
    NSLog(@"点击了确定按钮");
    if ([self.delegate respondsToSelector:@selector(exchangeCouponViewDelegate:addDefineButton:)]) {
        [self.delegate exchangeCouponViewDelegate:self addDefineButton:defineButton];
    }

}

- (void)setCoupon:(BeanCoupon *)coupon {
    _coupon = coupon;
    //设置兑换图片
    [self.exchangeImageView sd_setImageWithURL:[NSURL URLWithString:[coupon getCouponSmallImgUrl]] placeholderImage:[UIImage imageNamed:@"imgMid"]];
    
    //设置兑换天数
    self.exchangeLabel.text = [NSString stringWithFormat:@"为您开通%@天的VIP会员", [coupon getVipDays]];
}